Step 1: Gather the ingredients
2 cups all-purpose flour
1/2 teaspoon baking soda
1/2 teaspoon salt
3/4 cup unsalted butter
1 cup packed brown sugar
1/2 cup white sugar
1 tablespoon vanilla extract
1 egg yolk
2 cups semisweet chocolate chips
Preheat the oven to 325 degrees F. Grease 3 cookie sheets.
Step 2: Mix together dry ingredients
Step 3: Mix it up
Beat in the vanilla, egg, and egg yolk until light and creamy.
Mix in the sifted ingredients until just blended.
Stir in the chocolate chips by hand, using a wooden spoon.
Step 4: Scoop, drop, and bake
Place cookies in the preheated oven and bake for 15-17 minutes, or until edges are lightly toasted.